CN107576855B - Low-conductivity microsensor and use method thereof - Google Patents
Low-conductivity microsensor and use method thereof Download PDFInfo
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Abstract
The invention discloses a low-conductivity microsensor and a use method thereof, wherein the microsensor comprises a substrate, a circular current electrode, an annular voltage electrode, an annular grounding electrode and an electrode pad; all the electrodes are concentrically arranged on the same surface of the substrate and are a current electrode, a voltage electrode and a grounding electrode from inside to outside in sequence; the electrode pads are positioned on the electrode vertical surfaces of the substrate and are connected with the electrodes through leads, the voltage electrodes comprise six concentric rings which are equal in width and are distributed at equal intervals, and a first electrode, a second electrode, a third electrode, a fifth electrode and a sixth electrode are sequentially arranged from inside to outside, wherein the first electrode, the third electrode and the fifth electrode form a first voltage electrode, and the rest form a second voltage electrode. When the liquid conductivity measuring device is used, the annular grounding electrode is used for shielding external electromagnetic interference, an excitation current signal is applied to the circular current electrode, the voltage between the two voltage electrodes is measured at the same time, and the liquid conductivity can be obtained through calculation. The circular annular electrode can avoid the influence of the water flow direction on the measurement result, the contact area of the electrode and the measured liquid is large, and the measurement precision can be improved.
Description
Technical Field
The invention relates to the field of water quality detection, in particular to a low-conductivity microsensor and a use method thereof.
Background
The conductivity is one of the basic parameters of water quality detection, and in some water bodies with lower conductivity, such as shallow sea, estuary, reservoir and the like, the monitoring of the water quality usually requires effective monitoring in real time for a long time, so that the conductivity sensor used for monitoring is required to have low power consumption and low cost, can operate for a long time, and is convenient to maintain and popularize. In a common conductivity sensor structure, a conductivity sensor composed of a pair of planar interdigital electrodes has a low conductivity cell constant, and is particularly suitable for water quality detection of low-conductivity water body. The 'MEMS electrode type low conductivity sensor and the measuring method thereof' with the application number of 201611026949.4 utilizes the rectangular interdigital structure as the detection electrode to detect the water conductivity, the excitation electrode and the detection electrode are separated, the polarization influence is eliminated, meanwhile, the grounding electrodes on the two sides reduce the influence of surrounding signals on the measurement result to a certain extent, but the rectangular interdigital structure in the scheme can not avoid the influence of the water flow direction on the detection result, on the other hand, the grounding electrodes on the two sides do not form a complete sealed area on the rectangular interdigital structure, the shielding of external signals is not thorough, and the application of the sensor in water quality detection is limited.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a low-conductivity microsensor, which solves the technical problems that the detection result of the low-conductivity microsensor is influenced by the water flow direction and has relatively weak capability of shielding external signals in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a low conductivity microsensor, characterized by: the device comprises a substrate, a circular current electrode, an annular voltage electrode, an annular grounding electrode and an electrode pad; the current electrode, the voltage electrode and the grounding electrode are concentrically arranged on the same surface of the substrate and are sequentially arranged from inside to outside; the electrode pad is arranged on the electrode opposite surface of the substrate; the substrate is also provided with a plurality of through holes vertical to the electrode connecting surface; the axes of the through holes are coplanar, and the through holes are filled with leads; the lead wires are connected with the electrodes and the electrode pads; the voltage electrodes include a first voltage electrode and a second voltage electrode.
The low-conductivity microsensor is characterized in that: the voltage electrode comprises six concentric rings which are equal in width and are distributed at equal intervals, and a first ring, a second ring, a third ring, a fourth ring, a fifth ring and a sixth ring are sequentially arranged from inside to outside; the first voltage electrode comprises a first circular ring, a third circular ring and a fifth circular ring; the second voltage electrode comprises a second circular ring, a fourth circular ring and a sixth circular ring; the electrode pads of the first circular ring, the third circular ring and the fifth circular ring are connected to form a first voltage electrode pad; the second circular ring, the fourth circular ring and the sixth circular ring are connected with each other to form a second voltage electrode pad; the first voltage electrode bonding pad and the second voltage electrode are distributed on two sides of the current electrode bonding pad.
The low-conductivity microsensor is characterized in that: the substrate is FR4 or LCP.
The low-conductivity microsensor is characterized in that: the current electrode, the voltage electrode, the grounding electrode and all the electrode pads are made of nickel materials plated with gold on the surfaces.
The low-conductivity microsensor is characterized in that: the current electrode is connected with the signal generator, the first voltage electrode and the second voltage electrode are connected with the voltmeter, and the grounding electrode is grounded.
A method of using the low conductivity microsensor as described above: the method is characterized in that: firstly, the low-conductivity microsensor is placed into liquid to be measured, then grounding treatment is carried out on a grounding electrode, then a signal generator is started to send an alternating current excitation current signal I, the signal I is transmitted to a current electrode, then a voltage amplitude V between a first voltage electrode and a second voltage electrode is measured through a voltmeter, during measurement, the amplitude V of the voltage needs to be kept through an operational amplifier feedback circuit, and the conductivity of the measured water body is obtained through the following formula:
wherein K is the conductance cell constant.
The invention achieves the following beneficial effects:
1. the invention carries out the measurement of the conductivity by separating the current electrode and the voltage electrode, namely separating the generating end and the detecting end of the signal, thereby eliminating the influence of polarization impedance and improving the measurement precision.
2. The annular grounding electrode is positioned on the outermost side of the concentric circles, so that a better shielding effect is achieved on the current electrode and the voltage electrode inside, and the electromagnetic interference of the external environment on the sensor is reduced to the greatest extent.
3. All the electrodes in the invention are annular or circular, so that the influence of the water flow direction on the measurement result can be avoided; compared with the sensor formed by the electrodes with other shapes, the sensor formed by the annular electrode and the circular electrode has the advantages that under the same driving condition, a larger proportion of electric fields can be detected by the detection electrode, and the measurement sensitivity is improved; when partial voltage electrodes are covered by dirt, other uncovered parts can still sense normal voltage signals, the anti-pollution capacity is improved, and the robustness of the sensor is enhanced.
4. The first voltage electrode and the second voltage electrode are both of a plurality of concentric circle structures, so that the contact area between the detection electrode and the detected liquid is increased, and the measurement precision is improved.
5. The electrodes and the corresponding electrode pads are arranged on the two sides of the substrate through the through hole leads, so that the integrity of each electrode is ensured, and the parasitic effect caused by leading out the leads from the substrate on the same side of the electrodes is avoided.
6. The sensor has the advantages of simple structure, small size, convenient operation, high measurement precision, low cost, strong robustness and the like.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is a top view of an electrode of the present invention;
the meaning of the symbols in the drawings:
1-a substrate; 201-current electrodes; 202-a first circular ring; 203-a second circular ring; 204-third ring; 205-a fourth ring; 206-fifth ring; 207-sixth ring; 208-ground electrode; 401 — current electrode pad; 402-a first voltage electrode pad; 403-a second voltage electrode pad; 404-ground electrode pad.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
A low conductivity microsensor, characterized by: comprises a substrate 1, a circular current electrode 201, an annular voltage electrode, an annular grounding electrode 208 and an electrode pad; the current electrode 201, the voltage electrode and the grounding electrode 208 are concentrically arranged on the same surface of the substrate 1, and the current electrode 201, the voltage electrode and the grounding electrode 208 are arranged from inside to outside in sequence; the electrode pads are arranged on the opposite surfaces of the electrodes of the substrate 1; the substrate 1 is also provided with a plurality of through holes vertical to the electrode connecting surface; the axes of the through holes are coplanar, and the through holes are filled with leads; the lead wires are connected with the electrodes and the electrode pads; the voltage electrodes include a first voltage electrode and a second voltage electrode.
The voltage electrode comprises six concentric rings which are equal in width and are distributed at equal intervals, and a first ring 202, a second ring 203, a third ring 204, a fourth ring 205, a fifth ring 206 and a sixth ring (207) are arranged from inside to outside in sequence; the first voltage electrode comprises a first circular ring 202, a third circular ring 204 and a fifth circular ring 206; the second voltage electrode comprises a second circular ring 203, a fourth circular ring 205 and a sixth circular ring 207; the electrode pads of the first ring 202, the third ring 204 and the fifth ring 206 are connected to form a first voltage electrode pad 402; the electrode pads of the second ring 203, the fourth ring 205 and the sixth ring 207 are connected to form a second voltage electrode pad 403; the first voltage electrode pad 402 and the second voltage electrode pad 403 are distributed on both sides of the current electrode pad 401.
The substrate 1 is FR4 or LCP.
The current electrode 201, the voltage electrode, the ground electrode 208 and the electrode pad are all made of nickel material with gold-plated surface.
The current electrode pad 401 is connected with a signal generator, the first voltage electrode pad 402 and the second voltage electrode pad 403 are connected with a voltmeter, and the grounding electrode pad 404 is grounded.
When the low-conductivity micro-sensor is used, the low-conductivity micro-sensor is placed in liquid to be detected, and then the grounding electrode bonding pad 404 is grounded, so that a shielding area is formed inside the annular grounding electrode 208, the central current electrode and each ring of the two voltage electrodes are located in the shielding area, and the influence of external electromagnetic interference factors on the internal electrodes can be eliminated to the maximum extent. The starting signal source sends out an alternating current excitation current signal I, the current signal I is conducted to the central current electrode 201, an alternating current electric field is generated between the central current electrode 201 and the annular grounding electrode 208, and two voltage electrodes are adopted to detect the voltage V of the alternating current electric field. Since each electrode is annular or circular, a greater proportion of the electric field can be detected under the same driving conditions than with other shaped electrodes, and thus the sensitivity of the measurement is higher.
During measurement, the amplitude of the measurement voltage needs to be kept through an operational amplifier feedback circuit, and the conductivity of the measured water body is obtained through the following formula:
wherein K is the conductance cell constant.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A low conductivity microsensor, characterized by: the circuit comprises a substrate (1), a circular current electrode (201), an annular voltage electrode, an annular grounding electrode (208) and an electrode pad; the current electrode (201), the voltage electrode and the grounding electrode (208) are concentrically arranged on the same surface of the substrate (1), and the current electrode (201), the voltage electrode and the grounding electrode (208) are sequentially arranged from inside to outside; the electrode pad is arranged on the electrode opposite surface of the substrate (1); the substrate (1) is also provided with a plurality of through holes vertical to the electrode connecting surface; the axes of the through holes are coplanar, and the through holes are filled with leads; the lead wires are connected with the electrodes and the electrode pads; the voltage electrodes comprise a first voltage electrode and a second voltage electrode;
the voltage electrode comprises six concentric rings which are equal in width and are distributed at equal intervals, and a first ring (202), a second ring (203), a third ring (204), a fourth ring (205), a fifth ring (206) and a sixth ring (207) are sequentially arranged from inside to outside; the first voltage electrode comprises a first circular ring (202), a third circular ring (204) and a fifth circular ring (206); the second voltage electrode comprises a second circular ring (203), a fourth circular ring (205) and a sixth circular ring (207); the electrode pads of the first circular ring (202), the third circular ring (204) and the fifth circular ring (206) are connected to form a first voltage electrode pad (402); the electrode pads of the second circular ring (203), the fourth circular ring (205) and the sixth circular ring (207) are connected to form a second voltage electrode pad (403); the first voltage electrode bonding pad (402) and the second voltage electrode bonding pad (403) are distributed on two sides of the current electrode bonding pad (401);
the current electrode pad (401) is connected with a signal generator, the first voltage electrode pad (402) and the second voltage electrode pad (403) are connected with a voltmeter, and the grounding electrode pad (404) is grounded.
2. The low conductivity microsensor according to claim 1, wherein: the substrate (1) is FR4 or LCP.
3. The low conductivity microsensor according to claim 1, wherein: the current electrode (201), the voltage electrode, the grounding electrode (208) and all the electrode pads are made of nickel materials with gold-plated surfaces.
4. A method of using a low conductivity microsensor according to any of claims 1-3: the method is characterized in that: firstly, the low-conductivity microsensor is placed in liquid to be measured, then a grounding electrode bonding pad (404) is grounded, then a signal generator is started to send an alternating current excitation current signal I, the signal I is transmitted to a current electrode (201), then a voltage amplitude V between a first voltage electrode bonding pad (402) and a second voltage electrode bonding pad (403) is measured through a voltmeter, during measurement, the amplitude V of the voltage needs to be kept through an operational amplifier feedback circuit, and the conductivity of the measured water body is obtained through the following formula:
wherein K is the conductance cell constant.
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Citations (6)
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| CN201955321U (en) * | 2010-11-11 | 2011-08-31 | 保定市玮尔光电科技有限公司 | Conductivity sensor for petroleum logging wireless transmission |
| CN204856246U (en) * | 2015-07-14 | 2015-12-09 | 华南理工大学 | Aluminium alloy passivating process conductivity detection control apparatus |
| CN105388192A (en) * | 2015-12-24 | 2016-03-09 | 河海大学 | Seawater conductivity sensor based on MEMS silicone-glass bonding process |
| CN105629076A (en) * | 2015-12-24 | 2016-06-01 | 河海大学 | Manufacturing method of seven-electrode conductivity sensor based on MEMS silicon-glass technology |
| CN105628746A (en) * | 2015-12-24 | 2016-06-01 | 河海大学 | Method for manufacturing 7-electrode conductivity sensor based on MEMS (micro-electromechanical systems) silicon technology |
| CN106501615A (en) * | 2016-11-16 | 2017-03-15 | 河海大学 | A kind of MEMS electrode formula low conductivity sensor and its measuring method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010042637A1 (en) * | 2010-10-19 | 2012-04-19 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik GmbH + Co. KG | conductivity sensor |
| US9572522B2 (en) * | 2013-12-20 | 2017-02-21 | Verily Life Sciences Llc | Tear fluid conductivity sensor |
| CN206292752U (en) * | 2016-08-29 | 2017-06-30 | 红河以恒科技集团有限公司 | A kind of touch electrode structure, contact panel and touch control display apparatus |
| CN106645306A (en) * | 2017-02-09 | 2017-05-10 | 中国科学院计算技术研究所 | Electrode apparatus of conductivity sensor |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201955321U (en) * | 2010-11-11 | 2011-08-31 | 保定市玮尔光电科技有限公司 | Conductivity sensor for petroleum logging wireless transmission |
| CN204856246U (en) * | 2015-07-14 | 2015-12-09 | 华南理工大学 | Aluminium alloy passivating process conductivity detection control apparatus |
| CN105388192A (en) * | 2015-12-24 | 2016-03-09 | 河海大学 | Seawater conductivity sensor based on MEMS silicone-glass bonding process |
| CN105629076A (en) * | 2015-12-24 | 2016-06-01 | 河海大学 | Manufacturing method of seven-electrode conductivity sensor based on MEMS silicon-glass technology |
| CN105628746A (en) * | 2015-12-24 | 2016-06-01 | 河海大学 | Method for manufacturing 7-electrode conductivity sensor based on MEMS (micro-electromechanical systems) silicon technology |
| CN106501615A (en) * | 2016-11-16 | 2017-03-15 | 河海大学 | A kind of MEMS electrode formula low conductivity sensor and its measuring method |
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